Hong Kong's Citizen Smog Patrol

This transcript has been automatically generated and may not be 100% accurate.

I ... tickets on the mission ... the forty two year-old chemical engineer has smoky vehicle spotted ... a volunteer accredited by the Hong Kong city government to report cars and trucks ... didn't eat too much to the smoke ... I think it's almost like income dividend payout to one gallon NNM and Dodd ... you could note that the Nestle poetry ... he notes anyhow ... smokes ... Mr. Mack is one of thousands of Hong Kong residents have turned it into the city's pollution problem into action ... they're part of the Hong Kong ... smoky vehicle control program ... which for the last twenty years has enlisted Citizens ... help identify dirty smelly vehicles ... Tacomas one of the most polluted cities in the world ... while some of the blame goes to factories nearby southern China ... environmentalists a significant portion of the applicant's comes from ... commercial vehicles ... in particular ... aging diesel fuel trucks buses and delivery vans ... in terms of the pollution which affects human beings and in the Maoist it's certainly the emissions at the roadside which are the biggest public health problem ... so I would say that Tom about eighty nine was ninety percent of all emissions actually come from commercial diesel vehicles as opposed to private passenger vehicles ... Mr. met with duo was the training to learn how to identify when a vehicle spoke levels are too high ... when he spots a potential violation ... the files that the job report that the city's Environmental Protection Department ... the reported vehicles must undergo an emissions test ... if they fail ... the owners lose the vehicle license ... and face a choice ... of great their vehicle or scrapped their vehicle ... drivers who don't show up for an inspection can be stripped of the licence ... spotting a smoky vehicle is trickier than it sounds ... vehicles move quickly ... and OPAP's can sometimes be an unusual places ... and just because you see some smoke ... that doesn't mean it's over the legal limit ... I ... I think is ... typically loses some of the car ... AXA is moving so fast ... in the summer caused a city lot borderline case ... Andy FTTP up ... like a lot of ground motion could be light duty a coming of the top ... but last summer I would not mean that ... when I I think many children as they might leave the house ... Ford shares are held to high standards as well ... those who make incomplete reports stripped of the spotter privileges ... and eighty job report frequently enough ... you have to go through remedial training ... all of Hong Kong's drivers appreciate the work that the volunteers are doing ... some have complained that the episode livelihoods in the hands of others ... supporters say the results have been good for everyone ... the smoky vehicle Spire program a surprisingly high impact because Hong Kong only have about one hundred thousand ... diesel vehicles on mounted streets ... and found that ... out of the five thousand spotters two thousand active spotters irresponsible were for reporting ... around ten thousand of those vehicles ... but there are still potentially ninety thousand remaining offenders go there ... so sparsely Mr. Mack soldier on ... on last month's ... notice no more ... no one has received ... one of the downturn ... buses carry on doing that when among the working groups ... for The Wall Street Journal The says Jonathan Cheng ... Ho hum ... we don't yet know I ... know ...